When the sugar supplied by your last meal is more or less used up, insulin levels go back down to keep your blood sugar from falling further. In addition, stored sugar is released back into the bloodstream from the liver with the help of another hormone called glucogon.
Overhead costs come in two different forms: fixed and variable. The overhead rate is the cost, divided by the number of items produced or units of service sold. Fixed overhead costs are the same regardless of how productive the business is. Variable rates refer to costs that rise as productivity rises.
Overhead is considered a fixed cost, even though it may vary somewhat according to the amount of activity. Any cost that does not vary depending on production, volume, use, or sales levels, such as rent, property tax, insurance, or interest expense.